{"action":"Upgrade MessagePack to 2.5.301 (2.x) or 3.1.7 (3.x) or later.","affected":[{"fixed":"2.5.301","introduced":"0"},{"fixed":"3.1.7","introduced":"3.0"}],"component":"MessagePack","cve_ids":["CVE-2026-48515"],"ecosystem":"NuGet","epss":0.00405,"exploited":false,"fixed_versions":["2.5.301","3.1.7"],"ghsa_id":"GHSA-cxmj-83gh-fp49","id":"tcs_01M5N8KQDBCTZ9V5XTSXPFDBZZ","modified_at":"2026-06-25T21:41:30.326155Z","published_at":"2026-06-25T21:26:43Z","references":["https://osv.dev/vulnerability/GHSA-cxmj-83gh-fp49","https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-cxmj-83gh-fp49","https://nvd.nist.gov/vuln/detail/CVE-2026-48515","https://github.com/MessagePack-CSharp/MessagePack-CSharp"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-cxmj-83gh-fp49","url":"https://osv.dev/vulnerability/GHSA-cxmj-83gh-fp49"},{"source":"nvd","source_id":"CVE-2026-48515","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48515"}],"summary":"MessagePack-CSharp: Multi-dimensional array formatters allocate from unchecked dimensions"}